With an accomplice waiting in the car, the other two men waltzed into the famed hotel and ascended two flights of stairs to get to the ornate lobby surrounded by a dozen windowed cases from an assortment of high-end retailers.

They struck up a conversation with a hotel staffer about the Jacob & Co. case while concealing a sledgehammer, sources said.

When the coast was clear, one of the thugs smashed the glass and they scooped out the jewels. The pair then strolled untouched out the front door.

Their escape was assisted by a shocking amount of faulty surveillance cameras in the Four Seasons lobby.